package com.dcy.dao;

import com.dcy.domain.Student;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface StudentDao {
    public Student selectById(Integer id);
    public Long countStudent();
    //查询结果返回的是一个Map结构
    public Map<Object,Object> selectMap(Integer id);
}
